Iris Power Epoxy Mica Capacitors (EMC)

Partial Discharge Sensors for Testing Motors and Generators

Sensors installed on the machine terminals to detect partial discharge activity

Hydro Generator
Turbine Generator
Works with These Assets


  • Voltage endurance tested to >1000 hours at 30 kVrms (16 kV EMC)
  • Capacitance rating: 80 pF +/- 4 pF
  • PDEV Sensitivity: 1 pC (ASTM D1868 and IEC 60270)
  • Bandwidth into 50 ohms (3 dB): 40 MHz to 500 MHz
  • Operating temperature range: -50 °C to +130 °C (-58 °F to +266 °F)
  • Calculated 60,000 year life (tested to IEEE 930-1987)
  • Inclined Plane Tracking Test (ASTM D2303-85): 300 min
  • Comparative Tracking Index (IEC 60112): 600 min
  • Meets ANSI C37.20.2
  • Meets all the reliability requirements in IEC TS 60034-27-2 and IEEE 1434 for PD sensors


Four different voltage rated EMCs are available – 6.9 kV, 16 kV, 25 kV and 28 kV

EMC kits with installation material according to IEEE 323-1983 for nuclear power generating stations are available

Group Created with Sketch. Applications

The durable Iris Power Epoxy Mica Capacitors (EMCs) are designed to detect Partial Discharge (PD) activity in motors and generators while not imposing on the machine’s operation or reliability in any way.